增材制造TC4钛合金在激光抛光前后的电化学腐蚀性能 
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Electrochemical Corrosion Behaviors Before and After Laser Polishing of Additive Manufactured TC4 Titanium Alloy
1 上海交通大学机械与动力工程学院, 上海 200240
2 上海理工大学机械工程学院, 上海 200093
3 机械系统与振动国家重点实验室, 上海 200240
图 & 表
图 1. 增材制造钛合金样块及激光抛光扫描方式。(a)增材制造钛合金样块;(b)激光扫描方式
Fig. 1. AM TC4 titanium alloy sample and scanning mode of laser polishing. (a) Sample of AM TC4 titanium alloy; (b) scanning mode of laser polishing
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图 2. 抛光前、后钛合金的极化曲线
Fig. 2. Comparison of polarization curves of initial and laser polished surfaces
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图 3. 不同方向的抛光表面轮廓。(a) x方向;(b) y方向
Fig. 3. Profiles of laser polished surfaces in different directions. (a) In x direction; (b) in y direction
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图 4. 抛光表面实物图
Fig. 4. Picture of laser polished surface
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图 5. 钛合金抛光前、后的显微组织。(a)抛光前;(b)抛光后
Fig. 5. Microstructures of titanium alloy before and after laser polishing. (a) Initial surface; (b) polished surface
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图 6. 钛合金抛光前、后的XRD谱
Fig. 6. XRD spectra of titanium alloy before and after laser polishing
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图 7. 抛光前、后钛合金的晶粒图。(a)抛光前;(b)抛光后
Fig. 7. Grains of titanium alloy before and after laser polishing. (a) Initial surface; (b) polished surface
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图 8. 抛光前、后钛合金表面的晶粒尺寸统计。(a)抛光前;(b)抛光后
Fig. 8. Grain sizes of titanium alloy before and after laser polishing. (a) Initial surface; (b) polished surface
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表 1TC4钛合金的化学成分
Table1. Chemical composition of TC4 titanium alloy
| Element | Al | V | Fe | C | O | N | H | Ti |
|---|
| Mass fraction /% | 5.5-6.5 | 3.5-4.5 | 0-0.25 | 0-0.08 | 0-0.13 | 0-0.05 | 0-0.12 | Balance |
|
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表 2激光抛光实验参数
Table2. Experimental parameters of laser polishing
| Parameter | Laserpower /W | Scanning speed /(mm·s-1) | Hatchingspace /μm |
|---|
| Value | 150 | 10 | 150 |
|
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表 3抛光前、后钛合金的自腐蚀电位与自腐蚀电流密度
Table3. Self-corrosion potential and self-corrosion current density of initial and laser polished surfaces
| Sample | Self-corrosionpotential /V | Self-corrosion currentdensity /(μA·cm-2) |
|---|
| Initial TC4 | -0.398 | 3.132 | | Polished TC4 | -0.155 | 8.612 |
|
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表 4激光抛光前、后钛合金的表面粗糙度
Table4. Surface roughness of titanium alloy before and after laser polishing
| Sample | Ra(x) /μm | (x) /μm | Ra(y) /μm | (y) /μm | /μm |
|---|
| Initial TC4 | 12.34 | 12.44 | 12.53 | 12.44 | 11.96 | 12.28 | 12.31 | 12.18 | 12.3 | | Polished TC4 | 0.70 | 0.75 | 0.84 | 0.76 | 1.02 | 1.03 | 1.06 | 1.04 | 0.9 |
|
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表 5表面残余应力的测试结果
Table5. Test results of residual stress of initial and laser polished surfaces
| Sample | Residual stress(x) /MPa | Residualstress (y) /MPa |
|---|
| Polished TC4 | 132.9±68 | 145.1±117.7 | | Initial TC4 | -981.5±66.9 | -826.5±135.2 |
|
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廖聪豪, 周静, 沈洪. 增材制造TC4钛合金在激光抛光前后的电化学腐蚀性能[J]. 中国激光, 2020, 47(1): 0102003. Conghao Liao, Jing Zhou, Hong Shen. Electrochemical Corrosion Behaviors Before and After Laser Polishing of Additive Manufactured TC4 Titanium Alloy[J]. Chinese Journal of Lasers, 2020, 47(1): 0102003.
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